Mucosal-associated T cells, NK cells, and monocytes were negatively correlated with PDCD10 expression, while B cells, dendritic cells, CD4+ T cells, iTregs, nTregs, and Tr1s were positively correlated, suggesting that PDCD10 may promote the formation of the suppressive immune microenvironment in cholangiocarcinoma [104]. Here, CD4 is linked to cholangiocarcinoma.